diff --git a/packages/twenty-server/src/engine/core-modules/auth/controllers/google-apis-auth.controller.ts b/packages/twenty-server/src/engine/core-modules/auth/controllers/google-apis-auth.controller.ts
index a5b1a7a6df..853b5ab960 100644
--- a/packages/twenty-server/src/engine/core-modules/auth/controllers/google-apis-auth.controller.ts
+++ b/packages/twenty-server/src/engine/core-modules/auth/controllers/google-apis-auth.controller.ts
@@ -96,7 +96,7 @@ export class GoogleAPIsAuthController {
         id: workspaceId,
       });
 
-      const handle = emails[0].value;
+      const handle = emails[0].value.toLowerCase();
 
       const connectedAccountId =
         await this.googleAPIsService.refreshGoogleRefreshToken({
diff --git a/packages/twenty-server/src/engine/core-modules/auth/controllers/microsoft-apis-auth.controller.ts b/packages/twenty-server/src/engine/core-modules/auth/controllers/microsoft-apis-auth.controller.ts
index 55d024d33e..827666d0dc 100644
--- a/packages/twenty-server/src/engine/core-modules/auth/controllers/microsoft-apis-auth.controller.ts
+++ b/packages/twenty-server/src/engine/core-modules/auth/controllers/microsoft-apis-auth.controller.ts
@@ -103,7 +103,7 @@ export class MicrosoftAPIsAuthController {
         );
       }
 
-      const handle = emails[0].value;
+      const handle = emails[0].value.toLowerCase();
 
       const connectedAccountId =
         await this.microsoftAPIsService.refreshMicrosoftRefreshToken({